An efficient total synthesis of (+/-)-13-epineostenine (2) has been achieved in 15 steps and 17% overall yield. This approach involved the key alkylation/Michael additions of the central 1,4-cyclohexanedione monoethylene acetal and all of the stereocenters on central cyclohexane moiety were generated in highly stereoselectivity. (C) 2009 Elsevier Ltd. All rights reserved.
An efficient total synthesis of (+/-)-13-epineostenine (2) has been achieved in 15 steps and 17% overall yield. This approach involved the key alkylation/Michael additions of the central 1,4-cyclohexanedione monoethylene acetal and all of the stereocenters on central cyclohexane moiety were generated in highly stereoselectivity. (C) 2009 Elsevier Ltd. All rights reserved.